.header {
  position: fixed;
  display: block;
  width: 100%;
  height: 62px;
  top: 0;
  padding: 0px;
  background-color: #F1F7F8;
  box-sizing: border-box;
  z-index: 1000;
}
@media (min-width: 768px) {
  .header {
    position: relative;
    height: 110px;
    padding: 0px;
		align-items: center;
    justify-content: space-between;
  }
}
.header .container {
  position: relative;
	display: flex;
  width: 100%;
	height: 62px;
  flex-direction: row;
  flex-wrap: nowrap;
	justify-content: space-between;
}
@media (min-width: 768px) {
  .header .container {
    width: 1040px;
	  height: 110px;
  }
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  box-sizing: border-box;
}

.nav-button {
  position: absolute;
  right: 1rem;
  top: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.2rem;
  height: 2.5rem;
  cursor: pointer;
}
.nav-button span {
  width: 100%;
  height: 100%;
  display: block;
  background: url(../../images/study_assist/icon-bar.svg);
  background-size: 100% auto;
  background-repeat: no-repeat;
  background-position: center;
}
@media (min-width: 768px) {
  .nav-button {
    display: none;
  }
}

.close-button {
  position: fixed;
  right: 1rem;
  top: 1rem;
  width: 2.2rem;
  height: 2.2rem;
  cursor: pointer;
}
.close-button span {
  width: 100%;
  height: 100%;
  display: block;
  background: url(../../images/study_assist/icon-close.svg);
  background-size: 100% auto;
  background-repeat: no-repeat;
  background-position: center;
}
@media (min-width: 768px) {
  .close-button {
    display: none;
  }
}

.sp-nav {
  position: fixed;
  top: 0;
  left: 0;
  display: none;
  z-index: 1000;
  width: 100%;
  height: 100vh;
  overflow: auto;
  padding: 2.4rem 0 4rem;
  font-size: 2.4rem;
  text-align: center;
  background-color: #4680a3;
}
.sp-nav dl {
  color: #fff;
}
.sp-nav .footer-info {
  width: 100%;
  position: absolute;
  bottom: 0;
  left: 0;
}

.sp-nav-top {
  padding: 1rem 2.4rem;
}
.sp-nav-top a {
  text-align: left;
  display: block;
  color: #fff;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
}

.sp-nav-list {
  padding: 0;
  margin: 0;
  list-style: none;
}
.sp-nav-list > li {
  text-align: left;
  margin-bottom: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.5);
  padding: 1.5rem 2.4rem 0;
}
.sp-nav-list > li a {
  display: block;
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
}
.sp-nav-list > li img {
  width: 120px;
  height: auto;
}
.sp-nav-list li.haschild a.active i:before {
  content: "\f0dd";
}
.sp-nav-list li.haschild .submenu {
  display: none;
}
.sp-nav-list .submenu {
  padding: 0 0 0 20px;
}
.sp-nav-list .submenu li {
  padding: 15px 0 0;
}
.sp-nav-list .submenu li a {
  font-size: 13px;
}
.sp-nav-list .submenu li a i {
  margin-right: 5px;
  font-size: 12px;
}

.pc-nav {
  display: none;
}
@media (min-width: 768px) {
  .pc-nav {
    display: block;
    height: 67px;
  }
}

.pc-nav-list {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0;
  margin: 0;
  list-style: none;
}
.pc-nav-list li {
  margin: 0 0 0 0;
}
.pc-nav-list li a {
  padding: 0 1.2rem;
  color: #000;
  font-size: 1.5rem;
}
.pc-nav-list li a:last-child {
  padding: 0 0 0 2.5rem;
}
.pc-nav-list li a img {
  width: 140px;
  height: auto;
}

.logo {
	width: 160px;
  height: 62px;
  margin-left: 20px;
  display: flex;
  align-items: center;
}
.logo img {
	height: auto;
  max-height: 100%;
}
@media (min-width: 768px) {
	.logo {
		width: 200px; 
	  height: 110px;
    margin: 0px;
	}
}